var utils = {
    plus: function(a, b) {
        return a + b
    },
    minus: function(a, b) {
        return a - b;
    },
    mul: function(a, b) {
        return a * b;
    },
    div: function(a, b) {
        return a / b
    }
}

var utils = (function() {
    function test() {
        console.log(12);
    }

    function test1() {
        console.log(12);
    }

    function test2() {
        console.log(12);
    }
    return {
        test: test,
        test1: test1,
        test2: test2
    }
})()